Installation and commissioning
DIGIDRIVE
Variable speed drive
Réf. 3218 GB - 4.33 / d - 02.02
LEROY-SOMER
29
3.5.5.3 - Wiring inside the cabinet
1) Do not run the control cables and the
power cables in the same cable ducts.
2) For control cables, use a shielded
twisted cable with tight copper shielding
mesh and connect the shielding to the 0V at
the drive end only.
3) Fit an RC filter to relays and contactors
which are near the drive or are electrically
connected to the drive.
3.5.5.4 - Wiring outside the cabinet
1) Isolate the power cables from the control
cables.
2) Connect the motor earth terminal directly
to that of the drive.
3) Run the motor power supply cables and
the auxiliary cable, which links the motor
earth to that of the drive, in a metal cable
duct. This cable duct should be
mechanically connected to the cabinet and
the metal structure supporting the motor.
Fix the conductors securely at the bottom of
the duct.
4) Do not route the control cables (drive
and feedback) along metal structures
which may be shared by the motor support.
5) Isolate sensitive elements (probes,
sensors, etc) from metal structures which
may be shared by the motor support.
3.5.5.5 - Importance of ground wiring
The immunity and radio frequency
emission level are directly linked to the
quality of the ground connections. Metal
grounds should be mechanically connected
to each other with the largest possible
electrical contact area.
Under no circumstances can the earth
grounds, which are designed to protect
personnel by linking metal grounds to earth
via a cable, serve as a substitute for the
ground connections.
3.5.6 - IT mains supply
On IT mains supplies, the phase potential
and the earth potential are not closely
associated. The drive power supply may
therefore be subjected to significant
transient interference in the voltage,
between phases and/or between phase
and neutral.
To avoid drive malfunctions in this situation,
it is advisable to place chokes in series in
the drive power supply which oppose the
transient interference with a high
impedance, significantly reducing the
amplitude of this interference.
For choke selection, see the table of mains
chokes in section 3.5.2.
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